SummaryMonitoringWeekly Monitoring: On May 10th, Anuradhapura, Kandy, Badulla districts received up to 40 mm of rainfall; Matale, Kurunegala and Nuwara Eliya districts up to 30 mm; Polonnaruwa, Ampara, Kegalla and Ratnapura districts up to 20 mm; and most parts of the island up to 10 mm. On the 11th Hambantota district received up to 40 mm of rainfall; Matale district up to 30 mm; Vavuniya, Anuradhapura, Kurunegala, Kandy, Badulla, Monaragala, Ampara. Ratnapura and Matara districts up to 20mm; and most parts of the island up to 10 mm. On the 12th Mullaitivu district received up to 160 mm of rainfall; Vavuniya district up to 90 mm; Anuradhapura district up to 60 mm; Mannar, Matale, Kegalla, Ratnapura, Badulla, Monaragala districts and northern region of Trincomalee district up to 30 mm; and Kilinochchi and Colombo districts up to 20 mm. On the 13th Polonnaruwa district received up to 50 mm of rainfall; Matale and Anuradhapura districts up to 30 mm; and Badulla, Monaragala and Ratnapura districts up to 20 mm. On the 14th Ratnapura district received up to 60 mm of rainfall; Kalutara, Galle and Matara districts up to 30 mm; and Gampaha, Colombo and Trincomalee districts up to 20 mm.

Total Rainfall for past week : The RFE 2.0 tool shows total rainfall up to 200 mm in Mullaitivu district; up to 100 mm in Vavuniya, Anuradhapura, Matale, Polonnaruwa, Badulla, Kegalla and Ratnapura districts; up to 75 mm in Kurunegala, Kandy, Nuwara Eliya, Monaragala, Hambantota, Matara, Galle, Kalutara and Colombo districts; and up to 50 mm Ampara and Trincomalee districts. It shows above average rainfall of 100-200 mm for Mullaitivu and Vavuniya districts; and 50-100 mm for Anuradhapura, Matale, Badulla and Ratnapura districts; and up to 25-50 for most parts of the island.

Monthly Monitoring: During April - below average rainfall conditions were experienced in the entire island. Matale, Gampaha, Colombo, Ratnapura and Kandy districts received up to 210 mm below average rainfall; and many parts of the island received up to 150 mm. Monthly average rainfall for Anuradhapura, Kurunegala, Gampaha, Colombo, Ratnapura, Kegalla, Galle and Matara districts amounted to 210 mm/month; and 150 mm/month for Puttalam, Kandy, Matale, Badulla, Hambantota and Monaragala districts. The CPC Unified Precipitation Analysis tool shows ~200 mm of total rainfall in Anuradhapura, Gampaha, Colombo, Kalutara, Galle and Ratnapura districts; up to ~100 mm in Matale, Kandy, Nuwara Eliya, Badulla, Monaragala, Kurunegala and Hambantota districts; and up to ~75 mm Ampara, Puttalam and Mannar districts.

Seasonal Prediction: Apr to Jun: the total 3-month precipitation shall be climatological for the whole country. The 3-month temperature has more than 70-80% likelihood in the whole of the island of being in the above-normal tercile.

Ocean State (Text Courtesy IRI)PACIFIC SEAS STATE : May 11, 2017 By mid-May 2017, the tropical Pacific remained in an ENSO-neutral state, with above-average SSTs present in the eastern Pacific Ocean, and near-average SSTs across the central and east-central part of the basin. The collection of ENSO prediction models indicates increasing chances of El Niño into the summer and fall of 2017.

INDIAN OCEAN STATE : 0.5 OC above average sea surface temperature was observed in the seas around Sri Lanka.